Do not strip trailing slash of canonical URLs.
Do not strip trailing slash of canonical URLs.

Usually, links for posts are generated with a trailing slash, but
canonical URLs aren't.  Some services (e.g. http://b.hatena.ne.jp/)
are confused with that behavior.

We can fix it by removing canonical URLs, but then anyone may read
a post with /index.html URL and post the URL to some tool or service.
Therefore rel="canonical" seems useful IMHO.

Signed-off-by: OGINO Masanori <c49462fef669560e618607913e6c283f7627123c@gmail.com>

orangeiceberg/icebergist.com,dinomite/octopress,MrZoidberg/merkulov.me,jlestebanez/jlestebanez.com,sagitarchie/sagitarchie.github.io,hoavt/blog,splodingsocks/splodingsocks.github.io,teracyhq/blog,rderoldan1/octopress,bradurani/fractalbanana-src,dinomite/octopress,aprende-git/blog,yishuiliunian/yishuiliunian.github.io,nantescargobike/nantescargobike.github.io,happytcj/happytcj.github.io,nedzen/nedzen,rishma/rishma.github.io,paykin/blog,ToJans/tojans.me.dev,rbarros/rbarros.github.io,alanflorendo/alanflorendo,teze/teze.github.io.dbyll,felipecsl/oslimaviajando.com.br,dhpollack/resume,evolved/evolved.github.io,SeanMarcia/seanmarcia.github.com,nedzen/src.mariusnedelcu.com,teracyhq/blog,rmulligan/rybot,aweijnitz/mildly-interesting.info,rishma/rishma.github.io,bradurani/fractalbanana-src,fcrepo4-archive/fedora4lib,paykin/blog,jedcn/jedcn.com,aweijnitz/mildly-interesting.info,felipecsl/oslimaviajando.com.br,wbthomason/robotclass,OsgiliathEnterprise/projects.documentations,SeanMarcia/seanmarcia.github.com,padurean/padurean.github.io,rbarros/rbarros.github.io,wbthomason/robotclass,SciRuby/sciruby.com,MrZoidberg/merkulov.me,lexuszhi1990/lexuszhi1990.github.io,hoatle/teracy-blog,nedzen/src.mariusnedelcu.com,OsgiliathEnterprise/projects.documentations,hoatle/teracy-blog,aokon/home_page,nedzen/nedzen,SciRuby/sciruby.com,hoavt/blog,OsgiliathEnterprise/projects.documentations,user512/octopress-blog-testing,annacruz/anna-cruz.com,bigdatatools/doxecute-landing-page,lexuszhi1990/lexuszhi1990.github.io,mihcall/mihcall.github.io,splodingsocks/splodingsocks.github.io,takus/takus.github.com,nedzen/src.mariusnedelcu.com,jedcn/jedcn.com,thm-design/tonymeyer,dianw/dianw.github.io,murphyrandle/murphyrandle.github.io,dinomite/octopress,SciRuby/sciruby.com,nantescargobike/nantescargobike.github.io,Granada-pm/granada-pm-sources,alastairs/bobthebuilder-website,padurean/padurean.github.io,felipecsl/oslimaviajando.com.br,user512/octopress-blog-testing,siddhartha-gadgil/LogicTypesSpaces,rishiip/rishiip.github.io,user512/octopress-blog-testing,BWieber/bwieber.github.io,siddhartha-gadgil/AlgebraicTopology,siddhartha-gadgil/BasicAnalysisCourse,featureenvy/featureenvy.github.com,siddhartha-gadgil/BasicAnalysisCourse,RayHightower/rocksolar,eswdd/eswdd.github.io,bradurani/fractalbanana-src,betarelease/betarelease.github.com,dhpollack/resume,sagitarchie/sagitarchie.github.io,eswdd/eswdd.github.io,voxmatt/mattmartin,dianw/dianw.github.io,rbarros/rbarros.github.io,rmulligan/rybot,orangeiceberg/icebergist.com,BWieber/bwieber.github.io,evidal/www.eric-vidal.com,kubawalinski/mihcall.github.io,siddhartha-gadgil/LogicTypesSpaces,hoavt/blog,alanflorendo/alanflorendo,evolved/evolved.github.io,takus/takus.github.com,rishma/rishma.github.io,kubawalinski/mihcall.github.io,nantescargobike/nantescargobike.github.io,betarelease/betarelease.github.com,nedzen/nedzen,siddhartha-gadgil/LogicTypesSpaces,SeanMarcia/seanmarcia.github.com,voxmatt/mattmartin,RayHightower/rocksolar,orangeiceberg/icebergist.com,annacruz/anna-cruz.com,alanflorendo/alanflorendo,fcrepo4-archive/fedora4lib,kipyegonmark/kipyegonmarkblog,dhpollack/resume,Granada-pm/granada-pm-sources,eswdd/eswdd.github.io,aweijnitz/mildly-interesting.info,BWieber/bwieber.github.io,aprende-git/blog,aweijnitz/mildly-interesting.info,jlestebanez/jlestebanez.com,siddhartha-gadgil/BasicAnalysisCourse,nedzen/nedzen,lukekarrys/lukecod.es,sagitarchie/sagitarchie.github.io,murphyrandle/murphyrandle.github.io,betarelease/betarelease.github.com,Granada-pm/granada-pm-sources,bigdatatools/doxecute-landing-page,ToJans/tojans.me.dev,takus/takus.github.com,aokon/home_page,rderoldan1/octopress,evidal/www.eric-vidal.com,evidal/www.eric-vidal.com,murphyrandle/murphyrandle.github.io,RayHightower/rocksolar,siddhartha-gadgil/AlgebraicTopology,siddhartha-gadgil/AlgebraicTopology,jedcn/jedcn.com,alastairs/bobthebuilder-website,splodingsocks/splodingsocks.github.io,rbarros/rbarros.github.io,siddhartha-gadgil/LogicTypesSpaces,lexuszhi1990/lexuszhi1990.github.io,dinomite/octopress,hoatle/teracy-blog,kipyegonmark/kipyegonmarkblog,kipyegonmark/kipyegonmarkblog,rishiip/rishiip.github.io,nedzen/src.mariusnedelcu.com,yishuiliunian/yishuiliunian.github.io,teracyhq/blog,thm-design/tonymeyer,evidal/www.eric-vidal.com,mihcall/mihcall.github.io